8700 UVW different - TT vs. 5th Wheel

I have only had TT's in the past but am considering the move to a 5th wheel. TT UVW 8700# & max wt 10500 5th wheel 8700# & max weight 11500 Truck specs: 2009 chevy Hd2500 2wd, 3.73, 3250 payl...